1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
|
/*-
* Copyright (c) 2003-2007 Tim Kientzle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "archive_platform.h"
__FBSDID("$FreeBSD$");
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_write_private.h"
struct pax {
uint64_t entry_bytes_remaining;
uint64_t entry_padding;
struct archive_string pax_header;
};
static void add_pax_attr(struct archive_string *, const char *key,
const char *value);
static void add_pax_attr_int(struct archive_string *,
const char *key, int64_t value);
static void add_pax_attr_time(struct archive_string *,
const char *key, int64_t sec,
unsigned long nanos);
static void add_pax_attr_w(struct archive_string *,
const char *key, const wchar_t *wvalue);
static ssize_t archive_write_pax_data(struct archive_write *,
const void *, size_t);
static int archive_write_pax_finish(struct archive_write *);
static int archive_write_pax_destroy(struct archive_write *);
static int archive_write_pax_finish_entry(struct archive_write *);
static int archive_write_pax_header(struct archive_write *,
struct archive_entry *);
static char *base64_encode(const char *src, size_t len);
static char *build_pax_attribute_name(char *dest, const char *src);
static char *build_ustar_entry_name(char *dest, const char *src,
size_t src_length, const char *insert);
static char *format_int(char *dest, int64_t);
static int has_non_ASCII(const wchar_t *);
static char *url_encode(const char *in);
static int write_nulls(struct archive_write *, size_t);
/*
* Set output format to 'restricted pax' format.
*
* This is the same as normal 'pax', but tries to suppress
* the pax header whenever possible. This is the default for
* bsdtar, for instance.
*/
int
archive_write_set_format_pax_restricted(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
int r;
r = archive_write_set_format_pax(&a->archive);
a->archive_format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;
a->archive_format_name = "restricted POSIX pax interchange";
return (r);
}
/*
* Set output format to 'pax' format.
*/
int
archive_write_set_format_pax(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
struct pax *pax;
if (a->format_destroy != NULL)
(a->format_destroy)(a);
pax = (struct pax *)malloc(sizeof(*pax));
if (pax == NULL) {
archive_set_error(&a->archive, ENOMEM, "Can't allocate pax data");
return (ARCHIVE_FATAL);
}
memset(pax, 0, sizeof(*pax));
a->format_data = pax;
a->pad_uncompressed = 1;
a->format_write_header = archive_write_pax_header;
a->format_write_data = archive_write_pax_data;
a->format_finish = archive_write_pax_finish;
a->format_destroy = archive_write_pax_destroy;
a->format_finish_entry = archive_write_pax_finish_entry;
a->archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE;
a->archive_format_name = "POSIX pax interchange";
return (ARCHIVE_OK);
}
/*
* Note: This code assumes that 'nanos' has the same sign as 'sec',
* which implies that sec=-1, nanos=200000000 represents -1.2 seconds
* and not -0.8 seconds. This is a pretty pedantic point, as we're
* unlikely to encounter many real files created before Jan 1, 1970,
* much less ones with timestamps recorded to sub-second resolution.
*/
static void
add_pax_attr_time(struct archive_string *as, const char *key,
int64_t sec, unsigned long nanos)
{
int digit, i;
char *t;
/*
* Note that each byte contributes fewer than 3 base-10
* digits, so this will always be big enough.
*/
char tmp[1 + 3*sizeof(sec) + 1 + 3*sizeof(nanos)];
tmp[sizeof(tmp) - 1] = 0;
t = tmp + sizeof(tmp) - 1;
/* Skip trailing zeros in the fractional part. */
for (digit = 0, i = 10; i > 0 && digit == 0; i--) {
digit = nanos % 10;
nanos /= 10;
}
/* Only format the fraction if it's non-zero. */
if (i > 0) {
while (i > 0) {
*--t = "0123456789"[digit];
digit = nanos % 10;
nanos /= 10;
i--;
}
*--t = '.';
}
t = format_int(t, sec);
add_pax_attr(as, key, t);
}
static char *
format_int(char *t, int64_t i)
{
int sign;
if (i < 0) {
sign = -1;
i = -i;
} else
sign = 1;
do {
*--t = "0123456789"[i % 10];
} while (i /= 10);
if (sign < 0)
*--t = '-';
return (t);
}
static void
add_pax_attr_int(struct archive_string *as, const char *key, int64_t value)
{
char tmp[1 + 3 * sizeof(value)];
tmp[sizeof(tmp) - 1] = 0;
add_pax_attr(as, key, format_int(tmp + sizeof(tmp) - 1, value));
}
static char *
utf8_encode(const wchar_t *wval)
{
int utf8len;
const wchar_t *wp;
unsigned long wc;
char *utf8_value, *p;
utf8len = 0;
for (wp = wval; *wp != L'\0'; ) {
wc = *wp++;
if (wc <= 0x7f)
utf8len++;
else if (wc <= 0x7ff)
utf8len += 2;
else if (wc <= 0xffff)
utf8len += 3;
else if (wc <= 0x1fffff)
utf8len += 4;
else if (wc <= 0x3ffffff)
utf8len += 5;
else if (wc <= 0x7fffffff)
utf8len += 6;
/* Ignore larger values; UTF-8 can't encode them. */
}
utf8_value = (char *)malloc(utf8len + 1);
if (utf8_value == NULL) {
__archive_errx(1, "Not enough memory for attributes");
return (NULL);
}
for (wp = wval, p = utf8_value; *wp != L'\0'; ) {
wc = *wp++;
if (wc <= 0x7f) {
*p++ = (char)wc;
} else if (wc <= 0x7ff) {
p[0] = 0xc0 | ((wc >> 6) & 0x1f);
p[1] = 0x80 | (wc & 0x3f);
p += 2;
} else if (wc <= 0xffff) {
p[0] = 0xe0 | ((wc >> 12) & 0x0f);
p[1] = 0x80 | ((wc >> 6) & 0x3f);
p[2] = 0x80 | (wc & 0x3f);
p += 3;
} else if (wc <= 0x1fffff) {
p[0] = 0xf0 | ((wc >> 18) & 0x07);
p[1] = 0x80 | ((wc >> 12) & 0x3f);
p[2] = 0x80 | ((wc >> 6) & 0x3f);
p[3] = 0x80 | (wc & 0x3f);
p += 4;
} else if (wc <= 0x3ffffff) {
p[0] = 0xf8 | ((wc >> 24) & 0x03);
p[1] = 0x80 | ((wc >> 18) & 0x3f);
p[2] = 0x80 | ((wc >> 12) & 0x3f);
p[3] = 0x80 | ((wc >> 6) & 0x3f);
p[4] = 0x80 | (wc & 0x3f);
p += 5;
} else if (wc <= 0x7fffffff) {
p[0] = 0xfc | ((wc >> 30) & 0x01);
p[1] = 0x80 | ((wc >> 24) & 0x3f);
p[1] = 0x80 | ((wc >> 18) & 0x3f);
p[2] = 0x80 | ((wc >> 12) & 0x3f);
p[3] = 0x80 | ((wc >> 6) & 0x3f);
p[4] = 0x80 | (wc & 0x3f);
p += 6;
}
/* Ignore larger values; UTF-8 can't encode them. */
}
*p = '\0';
return (utf8_value);
}
static void
add_pax_attr_w(struct archive_string *as, const char *key, const wchar_t *wval)
{
char *utf8_value = utf8_encode(wval);
if (utf8_value == NULL)
return;
add_pax_attr(as, key, utf8_value);
free(utf8_value);
}
/*
* Add a key/value attribute to the pax header. This function handles
* the length field and various other syntactic requirements.
*/
static void
add_pax_attr(struct archive_string *as, const char *key, const char *value)
{
int digits, i, len, next_ten;
char tmp[1 + 3 * sizeof(int)]; /* < 3 base-10 digits per byte */
/*-
* PAX attributes have the following layout:
* <len> <space> <key> <=> <value> <nl>
*/
len = 1 + strlen(key) + 1 + strlen(value) + 1;
/*
* The <len> field includes the length of the <len> field, so
* computing the correct length is tricky. I start by
* counting the number of base-10 digits in 'len' and
* computing the next higher power of 10.
*/
next_ten = 1;
digits = 0;
i = len;
while (i > 0) {
i = i / 10;
digits++;
next_ten = next_ten * 10;
}
/*
* For example, if string without the length field is 99
* chars, then adding the 2 digit length "99" will force the
* total length past 100, requiring an extra digit. The next
* statement adjusts for this effect.
*/
if (len + digits >= next_ten)
digits++;
/* Now, we have the right length so we can build the line. */
tmp[sizeof(tmp) - 1] = 0; /* Null-terminate the work area. */
archive_strcat(as, format_int(tmp + sizeof(tmp) - 1, len + digits));
archive_strappend_char(as, ' ');
archive_strcat(as, key);
archive_strappend_char(as, '=');
archive_strcat(as, value);
archive_strappend_char(as, '\n');
}
static void
archive_write_pax_header_xattrs(struct pax *pax, struct archive_entry *entry)
{
struct archive_string s;
int i = archive_entry_xattr_reset(entry);
while (i--) {
const char *name;
const void *value;
char *encoded_value;
char *url_encoded_name = NULL, *encoded_name = NULL;
wchar_t *wcs_name = NULL;
size_t size;
archive_entry_xattr_next(entry, &name, &value, &size);
/* Name is URL-encoded, then converted to wchar_t,
* then UTF-8 encoded. */
url_encoded_name = url_encode(name);
if (url_encoded_name != NULL) {
/* Convert narrow-character to wide-character. */
int wcs_length = strlen(url_encoded_name);
wcs_name = (wchar_t *)malloc((wcs_length + 1) * sizeof(wchar_t));
if (wcs_name == NULL)
__archive_errx(1, "No memory for xattr conversion");
mbstowcs(wcs_name, url_encoded_name, wcs_length);
wcs_name[wcs_length] = 0;
free(url_encoded_name); /* Done with this. */
}
if (wcs_name != NULL) {
encoded_name = utf8_encode(wcs_name);
free(wcs_name); /* Done with wchar_t name. */
}
encoded_value = base64_encode((const char *)value, size);
if (encoded_name != NULL && encoded_value != NULL) {
archive_string_init(&s);
archive_strcpy(&s, "LIBARCHIVE.xattr.");
archive_strcat(&s, encoded_name);
add_pax_attr(&(pax->pax_header), s.s, encoded_value);
archive_string_free(&s);
}
free(encoded_name);
free(encoded_value);
}
}
/*
* TODO: Consider adding 'comment' and 'charset' fields to
* archive_entry so that clients can specify them. Also, consider
* adding generic key/value tags so clients can add arbitrary
* key/value data.
*/
static int
archive_write_pax_header(struct archive_write *a,
struct archive_entry *entry_original)
{
struct archive_entry *entry_main;
const char *linkname, *p;
char *t;
const char *hardlink;
const wchar_t *wp;
const char *suffix_start;
int need_extension, r, ret;
struct pax *pax;
char paxbuff[512];
char ustarbuff[512];
char ustar_entry_name[256];
char pax_entry_name[256];
need_extension = 0;
pax = (struct pax *)a->format_data;
hardlink = archive_entry_hardlink(entry_original);
/* Make sure this is a type of entry that we can handle here */
if (hardlink == NULL) {
switch (archive_entry_filetype(entry_original)) {
case AE_IFBLK:
case AE_IFCHR:
case AE_IFIFO:
case AE_IFLNK:
case AE_IFREG:
break;
case AE_IFDIR:
/*
* Ensure a trailing '/'. Modify the original
* entry so the client sees the change.
*/
p = archive_entry_pathname(entry_original);
if (p[strlen(p) - 1] != '/') {
t = (char *)malloc(strlen(p) + 2);
if (t != NULL) {
strcpy(t, p);
strcat(t, "/");
archive_entry_copy_pathname(entry_original, t);
free(t);
}
}
break;
default:
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"tar format cannot archive this (type=0%lo)",
(unsigned long)archive_entry_filetype(entry_original));
return (ARCHIVE_WARN);
}
}
/* Copy entry so we can modify it as needed. */
entry_main = archive_entry_clone(entry_original);
archive_string_empty(&(pax->pax_header)); /* Blank our work area. */
/*
* Determining whether or not the name is too big is ugly
* because of the rules for dividing names between 'name' and
* 'prefix' fields. Here, I pick out the longest possible
* suffix, then test whether the remaining prefix is too long.
*/
wp = archive_entry_pathname_w(entry_main);
p = archive_entry_pathname(entry_main);
if (strlen(p) <= 100) /* Short enough for just 'name' field */
suffix_start = p; /* Record a zero-length prefix */
else
/* Find the largest suffix that fits in 'name' field. */
suffix_start = strchr(p + strlen(p) - 100 - 1, '/');
/*
* If name is too long, or has non-ASCII characters, add
* 'path' to pax extended attrs.
*/
if (suffix_start == NULL || suffix_start - p > 155 || has_non_ASCII(wp)) {
add_pax_attr_w(&(pax->pax_header), "path", wp);
archive_entry_set_pathname(entry_main,
build_ustar_entry_name(ustar_entry_name, p, strlen(p), NULL));
need_extension = 1;
}
/* If link name is too long or has non-ASCII characters, add
* 'linkpath' to pax extended attrs. */
linkname = hardlink;
if (linkname == NULL)
linkname = archive_entry_symlink(entry_main);
if (linkname != NULL) {
/* There is a link name, get the wide version as well. */
if (hardlink != NULL)
wp = archive_entry_hardlink_w(entry_main);
else
wp = archive_entry_symlink_w(entry_main);
/* If the link is long or has a non-ASCII character,
* store it as a pax extended attribute. */
if (strlen(linkname) > 100 || has_non_ASCII(wp)) {
add_pax_attr_w(&(pax->pax_header), "linkpath", wp);
if (hardlink != NULL)
archive_entry_set_hardlink(entry_main,
"././@LongHardLink");
else
archive_entry_set_symlink(entry_main,
"././@LongSymLink");
need_extension = 1;
}
}
/* If file size is too large, add 'size' to pax extended attrs. */
if (archive_entry_size(entry_main) >= (((int64_t)1) << 33)) {
add_pax_attr_int(&(pax->pax_header), "size",
archive_entry_size(entry_main));
need_extension = 1;
}
/* If numeric GID is too large, add 'gid' to pax extended attrs. */
if (archive_entry_gid(entry_main) >= (1 << 18)) {
add_pax_attr_int(&(pax->pax_header), "gid",
archive_entry_gid(entry_main));
need_extension = 1;
}
/* If group name is too large or has non-ASCII characters, add
* 'gname' to pax extended attrs. */
p = archive_entry_gname(entry_main);
wp = archive_entry_gname_w(entry_main);
if (p != NULL && (strlen(p) > 31 || has_non_ASCII(wp))) {
add_pax_attr_w(&(pax->pax_header), "gname", wp);
archive_entry_set_gname(entry_main, NULL);
need_extension = 1;
}
/* If numeric UID is too large, add 'uid' to pax extended attrs. */
if (archive_entry_uid(entry_main) >= (1 << 18)) {
add_pax_attr_int(&(pax->pax_header), "uid",
archive_entry_uid(entry_main));
need_extension = 1;
}
/* If user name is too large, add 'uname' to pax extended attrs. */
/* TODO: If uname has non-ASCII characters, use pax attribute. */
p = archive_entry_uname(entry_main);
wp = archive_entry_uname_w(entry_main);
if (p != NULL && (strlen(p) > 31 || has_non_ASCII(wp))) {
add_pax_attr_w(&(pax->pax_header), "uname", wp);
archive_entry_set_uname(entry_main, NULL);
need_extension = 1;
}
/*
* POSIX/SUSv3 doesn't provide a standard key for large device
* numbers. I use the same keys here that Joerg Schilling
* used for 'star.' (Which, somewhat confusingly, are called
* "devXXX" even though they code "rdev" values.) No doubt,
* other implementations use other keys. Note that there's no
* reason we can't write the same information into a number of
* different keys.
*
* Of course, this is only needed for block or char device entries.
*/
if (archive_entry_filetype(entry_main) == AE_IFBLK
|| archive_entry_filetype(entry_main) == AE_IFCHR) {
/*
* If rdevmajor is too large, add 'SCHILY.devmajor' to
* extended attributes.
*/
dev_t rdevmajor, rdevminor;
rdevmajor = archive_entry_rdevmajor(entry_main);
rdevminor = archive_entry_rdevminor(entry_main);
if (rdevmajor >= (1 << 18)) {
add_pax_attr_int(&(pax->pax_header), "SCHILY.devmajor",
rdevmajor);
/*
* Non-strict formatting below means we don't
* have to truncate here. Not truncating improves
* the chance that some more modern tar archivers
* (such as GNU tar 1.13) can restore the full
* value even if they don't understand the pax
* extended attributes. See my rant below about
* file size fields for additional details.
*/
/* archive_entry_set_rdevmajor(entry_main,
rdevmajor & ((1 << 18) - 1)); */
need_extension = 1;
}
/*
* If devminor is too large, add 'SCHILY.devminor' to
* extended attributes.
*/
if (rdevminor >= (1 << 18)) {
add_pax_attr_int(&(pax->pax_header), "SCHILY.devminor",
rdevminor);
/* Truncation is not necessary here, either. */
/* archive_entry_set_rdevminor(entry_main,
rdevminor & ((1 << 18) - 1)); */
need_extension = 1;
}
}
/*
* Technically, the mtime field in the ustar header can
* support 33 bits, but many platforms use signed 32-bit time
* values. The cutoff of 0x7fffffff here is a compromise.
* Yes, this check is duplicated just below; this helps to
* avoid writing an mtime attribute just to handle a
* high-resolution timestamp in "restricted pax" mode.
*/
if (!need_extension &&
((archive_entry_mtime(entry_main) < 0)
|| (archive_entry_mtime(entry_main) >= 0x7fffffff)))
need_extension = 1;
/* I use a star-compatible file flag attribute. */
p = archive_entry_fflags_text(entry_main);
if (!need_extension && p != NULL && *p != '\0')
need_extension = 1;
/* If there are non-trivial ACL entries, we need an extension. */
if (!need_extension && archive_entry_acl_count(entry_original,
ARCHIVE_ENTRY_ACL_TYPE_ACCESS) > 0)
need_extension = 1;
/* If there are non-trivial ACL entries, we need an extension. */
if (!need_extension && archive_entry_acl_count(entry_original,
ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) > 0)
need_extension = 1;
/* If there are extended attributes, we need an extension */
if (!need_extension && archive_entry_xattr_count(entry_original) > 0)
need_extension = 1;
/*
* The following items are handled differently in "pax
* restricted" format. In particular, in "pax restricted"
* format they won't be added unless need_extension is
* already set (we're already generating an extended header, so
* may as well include these).
*/
if (a->archive_format != ARCHIVE_FORMAT_TAR_PAX_RESTRICTED ||
need_extension) {
if (archive_entry_mtime(entry_main) < 0 ||
archive_entry_mtime(entry_main) >= 0x7fffffff ||
archive_entry_mtime_nsec(entry_main) != 0)
add_pax_attr_time(&(pax->pax_header), "mtime",
archive_entry_mtime(entry_main),
archive_entry_mtime_nsec(entry_main));
if (archive_entry_ctime(entry_main) != 0 ||
archive_entry_ctime_nsec(entry_main) != 0)
add_pax_attr_time(&(pax->pax_header), "ctime",
archive_entry_ctime(entry_main),
archive_entry_ctime_nsec(entry_main));
if (archive_entry_atime(entry_main) != 0 ||
archive_entry_atime_nsec(entry_main) != 0)
add_pax_attr_time(&(pax->pax_header), "atime",
archive_entry_atime(entry_main),
archive_entry_atime_nsec(entry_main));
/* I use a star-compatible file flag attribute. */
p = archive_entry_fflags_text(entry_main);
if (p != NULL && *p != '\0')
add_pax_attr(&(pax->pax_header), "SCHILY.fflags", p);
/* I use star-compatible ACL attributes. */
wp = archive_entry_acl_text_w(entry_original,
ARCHIVE_ENTRY_ACL_TYPE_ACCESS |
ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID);
if (wp != NULL && *wp != L'\0')
add_pax_attr_w(&(pax->pax_header),
"SCHILY.acl.access", wp);
wp = archive_entry_acl_text_w(entry_original,
ARCHIVE_ENTRY_ACL_TYPE_DEFAULT |
ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID);
if (wp != NULL && *wp != L'\0')
add_pax_attr_w(&(pax->pax_header),
"SCHILY.acl.default", wp);
/* Include star-compatible metadata info. */
/* Note: "SCHILY.dev{major,minor}" are NOT the
* major/minor portions of "SCHILY.dev". */
add_pax_attr_int(&(pax->pax_header), "SCHILY.dev",
archive_entry_dev(entry_main));
add_pax_attr_int(&(pax->pax_header), "SCHILY.ino",
archive_entry_ino(entry_main));
add_pax_attr_int(&(pax->pax_header), "SCHILY.nlink",
archive_entry_nlink(entry_main));
/* Store extended attributes */
archive_write_pax_header_xattrs(pax, entry_original);
}
/* Only regular files have data. */
if (archive_entry_filetype(entry_main) != AE_IFREG)
archive_entry_set_size(entry_main, 0);
/*
* Pax-restricted does not store data for hardlinks, in order
* to improve compatibility with ustar.
*/
if (a->archive_format != ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE &&
hardlink != NULL)
archive_entry_set_size(entry_main, 0);
/*
* XXX Full pax interchange format does permit a hardlink
* entry to have data associated with it. I'm not supporting
* that here because the client expects me to tell them whether
* or not this format expects data for hardlinks. If I
* don't check here, then every pax archive will end up with
* duplicated data for hardlinks. Someday, there may be
* need to select this behavior, in which case the following
* will need to be revisited. XXX
*/
if (hardlink != NULL)
archive_entry_set_size(entry_main, 0);
/* Format 'ustar' header for main entry.
*
* The trouble with file size: If the reader can't understand
* the file size, they may not be able to locate the next
* entry and the rest of the archive is toast. Pax-compliant
* readers are supposed to ignore the file size in the main
* header, so the question becomes how to maximize portability
* for readers that don't support pax attribute extensions.
* For maximum compatibility, I permit numeric extensions in
* the main header so that the file size stored will always be
* correct, even if it's in a format that only some
* implementations understand. The technique used here is:
*
* a) If possible, follow the standard exactly. This handles
* files up to 8 gigabytes minus 1.
*
* b) If that fails, try octal but omit the field terminator.
* That handles files up to 64 gigabytes minus 1.
*
* c) Otherwise, use base-256 extensions. That handles files
* up to 2^63 in this implementation, with the potential to
* go up to 2^94. That should hold us for a while. ;-)
*
* The non-strict formatter uses similar logic for other
* numeric fields, though they're less critical.
*/
__archive_write_format_header_ustar(a, ustarbuff, entry_main, -1, 0);
/* If we built any extended attributes, write that entry first. */
ret = ARCHIVE_OK;
if (archive_strlen(&(pax->pax_header)) > 0) {
struct archive_entry *pax_attr_entry;
time_t s;
uid_t uid;
gid_t gid;
mode_t mode;
long ns;
pax_attr_entry = archive_entry_new();
p = archive_entry_pathname(entry_main);
archive_entry_set_pathname(pax_attr_entry,
build_pax_attribute_name(pax_entry_name, p));
archive_entry_set_size(pax_attr_entry,
archive_strlen(&(pax->pax_header)));
/* Copy uid/gid (but clip to ustar limits). */
uid = archive_entry_uid(entry_main);
if (uid >= 1 << 18)
uid = (1 << 18) - 1;
archive_entry_set_uid(pax_attr_entry, uid);
gid = archive_entry_gid(entry_main);
if (gid >= 1 << 18)
gid = (1 << 18) - 1;
archive_entry_set_gid(pax_attr_entry, gid);
/* Copy mode over (but not setuid/setgid bits) */
mode = archive_entry_mode(entry_main);
#ifdef S_ISUID
mode &= ~S_ISUID;
#endif
#ifdef S_ISGID
mode &= ~S_ISGID;
#endif
#ifdef S_ISVTX
mode &= ~S_ISVTX;
#endif
archive_entry_set_mode(pax_attr_entry, mode);
/* Copy uname/gname. */
archive_entry_set_uname(pax_attr_entry,
archive_entry_uname(entry_main));
archive_entry_set_gname(pax_attr_entry,
archive_entry_gname(entry_main));
/* Copy mtime, but clip to ustar limits. */
s = archive_entry_mtime(entry_main);
ns = archive_entry_mtime_nsec(entry_main);
if (s < 0) { s = 0; ns = 0; }
if (s > 0x7fffffff) { s = 0x7fffffff; ns = 0; }
archive_entry_set_mtime(pax_attr_entry, s, ns);
/* Ditto for atime. */
s = archive_entry_atime(entry_main);
ns = archive_entry_atime_nsec(entry_main);
if (s < 0) { s = 0; ns = 0; }
if (s > 0x7fffffff) { s = 0x7fffffff; ns = 0; }
archive_entry_set_atime(pax_attr_entry, s, ns);
/* Standard ustar doesn't support ctime. */
archive_entry_set_ctime(pax_attr_entry, 0, 0);
ret = __archive_write_format_header_ustar(a, paxbuff,
pax_attr_entry, 'x', 1);
archive_entry_free(pax_attr_entry);
/* Note that the 'x' header shouldn't ever fail to format */
if (ret != 0) {
const char *msg = "archive_write_pax_header: "
"'x' header failed?! This can't happen.\n";
write(2, msg, strlen(msg));
exit(1);
}
r = (a->compressor.write)(a, paxbuff, 512);
if (r != ARCHIVE_OK) {
pax->entry_bytes_remaining = 0;
pax->entry_padding = 0;
return (ARCHIVE_FATAL);
}
pax->entry_bytes_remaining = archive_strlen(&(pax->pax_header));
pax->entry_padding = 0x1ff & (-(int64_t)pax->entry_bytes_remaining);
r = (a->compressor.write)(a, pax->pax_header.s,
archive_strlen(&(pax->pax_header)));
if (r != ARCHIVE_OK) {
/* If a write fails, we're pretty much toast. */
return (ARCHIVE_FATAL);
}
/* Pad out the end of the entry. */
r = write_nulls(a, pax->entry_padding);
if (r != ARCHIVE_OK) {
/* If a write fails, we're pretty much toast. */
return (ARCHIVE_FATAL);
}
pax->entry_bytes_remaining = pax->entry_padding = 0;
}
/* Write the header for main entry. */
r = (a->compressor.write)(a, ustarbuff, 512);
if (r != ARCHIVE_OK)
return (r);
/*
* Inform the client of the on-disk size we're using, so
* they can avoid unnecessarily writing a body for something
* that we're just going to ignore.
*/
archive_entry_set_size(entry_original, archive_entry_size(entry_main));
pax->entry_bytes_remaining = archive_entry_size(entry_main);
pax->entry_padding = 0x1ff & (-(int64_t)pax->entry_bytes_remaining);
archive_entry_free(entry_main);
return (ret);
}
/*
* We need a valid name for the regular 'ustar' entry. This routine
* tries to hack something more-or-less reasonable.
*
* The approach here tries to preserve leading dir names. We do so by
* working with four sections:
* 1) "prefix" directory names,
* 2) "suffix" directory names,
* 3) inserted dir name (optional),
* 4) filename.
*
* These sections must satisfy the following requirements:
* * Parts 1 & 2 together form an initial portion of the dir name.
* * Part 3 is specified by the caller. (It should not contain a leading
* or trailing '/'.)
* * Part 4 forms an initial portion of the base filename.
* * The filename must be <= 99 chars to fit the ustar 'name' field.
* * Parts 2, 3, 4 together must be <= 99 chars to fit the ustar 'name' fld.
* * Part 1 must be <= 155 chars to fit the ustar 'prefix' field.
* * If the original name ends in a '/', the new name must also end in a '/'
* * Trailing '/.' sequences may be stripped.
*
* Note: Recall that the ustar format does not store the '/' separating
* parts 1 & 2, but does store the '/' separating parts 2 & 3.
*/
static char *
build_ustar_entry_name(char *dest, const char *src, size_t src_length,
const char *insert)
{
const char *prefix, *prefix_end;
const char *suffix, *suffix_end;
const char *filename, *filename_end;
char *p;
int need_slash = 0; /* Was there a trailing slash? */
size_t suffix_length = 99;
int insert_length;
/* Length of additional dir element to be added. */
if (insert == NULL)
insert_length = 0;
else
/* +2 here allows for '/' before and after the insert. */
insert_length = strlen(insert) + 2;
/* Step 0: Quick bailout in a common case. */
if (src_length < 100 && insert == NULL) {
strncpy(dest, src, src_length);
dest[src_length] = '\0';
return (dest);
}
/* Step 1: Locate filename and enforce the length restriction. */
filename_end = src + src_length;
/* Remove trailing '/' chars and '/.' pairs. */
for (;;) {
if (filename_end > src && filename_end[-1] == '/') {
filename_end --;
need_slash = 1; /* Remember to restore trailing '/'. */
continue;
}
if (filename_end > src + 1 && filename_end[-1] == '.'
&& filename_end[-2] == '/') {
filename_end -= 2;
need_slash = 1; /* "foo/." will become "foo/" */
continue;
}
break;
}
if (need_slash)
suffix_length--;
/* Find start of filename. */
filename = filename_end - 1;
while ((filename > src) && (*filename != '/'))
filename --;
if ((*filename == '/') && (filename < filename_end - 1))
filename ++;
/* Adjust filename_end so that filename + insert fits in 99 chars. */
suffix_length -= insert_length;
if (filename_end > filename + suffix_length)
filename_end = filename + suffix_length;
/* Calculate max size for "suffix" section (#3 above). */
suffix_length -= filename_end - filename;
/* Step 2: Locate the "prefix" section of the dirname, including
* trailing '/'. */
prefix = src;
prefix_end = prefix + 155;
if (prefix_end > filename)
prefix_end = filename;
while (prefix_end > prefix && *prefix_end != '/')
prefix_end--;
if ((prefix_end < filename) && (*prefix_end == '/'))
prefix_end++;
/* Step 3: Locate the "suffix" section of the dirname,
* including trailing '/'. */
suffix = prefix_end;
suffix_end = suffix + suffix_length; /* Enforce limit. */
if (suffix_end > filename)
suffix_end = filename;
if (suffix_end < suffix)
suffix_end = suffix;
while (suffix_end > suffix && *suffix_end != '/')
suffix_end--;
if ((suffix_end < filename) && (*suffix_end == '/'))
suffix_end++;
/* Step 4: Build the new name. */
/* The OpenBSD strlcpy function is safer, but less portable. */
/* Rather than maintain two versions, just use the strncpy version. */
p = dest;
if (prefix_end > prefix) {
strncpy(p, prefix, prefix_end - prefix);
p += prefix_end - prefix;
}
if (suffix_end > suffix) {
strncpy(p, suffix, suffix_end - suffix);
p += suffix_end - suffix;
}
if (insert != NULL) {
/* Note: assume insert does not have leading or trailing '/' */
strcpy(p, insert);
p += strlen(insert);
*p++ = '/';
}
strncpy(p, filename, filename_end - filename);
p += filename_end - filename;
if (need_slash)
*p++ = '/';
*p++ = '\0';
return (dest);
}
/*
* The ustar header for the pax extended attributes must have a
* reasonable name: SUSv3 suggests 'dirname'/PaxHeader/'filename'
*
* Joerg Schiling has argued that this is unnecessary because, in practice,
* if the pax extended attributes get extracted as regular files, noone is
* going to bother reading those attributes to manually restore them.
* Based on this, 'star' uses /tmp/PaxHeader/'basename' as the ustar header
* name. This is a tempting argument, but I'm not entirely convinced.
* I'm also uncomfortable with the fact that "/tmp" is a Unix-ism.
*
* The following routine implements the SUSv3 recommendation, and is
* much simpler because build_ustar_entry_name() above already does
* most of the work (we just need to give it an extra path element to
* insert and handle a few pathological cases).
*/
static char *
build_pax_attribute_name(char *dest, const char *src)
{
const char *p;
/* Handle the null filename case. */
if (src == NULL || *src == '\0') {
strcpy(dest, "PaxHeader/blank");
return (dest);
}
/* Prune final '/' and other unwanted final elements. */
p = src + strlen(src);
for (;;) {
/* Ends in "/", remove the '/' */
if (p > src && p[-1] == '/') {
--p;
continue;
}
/* Ends in "/.", remove the '.' */
if (p > src + 1 && p[-1] == '.'
&& p[-2] == '/') {
--p;
continue;
}
break;
}
/* Pathological case: After above, there was nothing left.
* This includes "/." "/./." "/.//./." etc. */
if (p == src) {
strcpy(dest, "/PaxHeader/rootdir");
return (dest);
}
/* Convert unadorned "." into a suitable filename. */
if (*src == '.' && p == src + 1) {
strcpy(dest, "PaxHeader/currentdir");
return (dest);
}
/* General case: build a ustar-compatible name adding "/PaxHeader/". */
build_ustar_entry_name(dest, src, p - src, "PaxHeader");
return (dest);
}
/* Write two null blocks for the end of archive */
static int
archive_write_pax_finish(struct archive_write *a)
{
struct pax *pax;
int r;
if (a->compressor.write == NULL)
return (ARCHIVE_OK);
pax = (struct pax *)a->format_data;
r = write_nulls(a, 512 * 2);
return (r);
}
static int
archive_write_pax_destroy(struct archive_write *a)
{
struct pax *pax;
pax = (struct pax *)a->format_data;
archive_string_free(&pax->pax_header);
free(pax);
a->format_data = NULL;
return (ARCHIVE_OK);
}
static int
archive_write_pax_finish_entry(struct archive_write *a)
{
struct pax *pax;
int ret;
pax = (struct pax *)a->format_data;
ret = write_nulls(a, pax->entry_bytes_remaining + pax->entry_padding);
pax->entry_bytes_remaining = pax->entry_padding = 0;
return (ret);
}
static int
write_nulls(struct archive_write *a, size_t padding)
{
int ret, to_write;
while (padding > 0) {
to_write = padding < a->null_length ? padding : a->null_length;
ret = (a->compressor.write)(a, a->nulls, to_write);
if (ret != ARCHIVE_OK)
return (ret);
padding -= to_write;
}
return (ARCHIVE_OK);
}
static ssize_t
archive_write_pax_data(struct archive_write *a, const void *buff, size_t s)
{
struct pax *pax;
int ret;
pax = (struct pax *)a->format_data;
if (s > pax->entry_bytes_remaining)
s = pax->entry_bytes_remaining;
ret = (a->compressor.write)(a, buff, s);
pax->entry_bytes_remaining -= s;
if (ret == ARCHIVE_OK)
return (s);
else
return (ret);
}
static int
has_non_ASCII(const wchar_t *wp)
{
while (*wp != L'\0' && *wp < 128)
wp++;
return (*wp != L'\0');
}
/*
* Used by extended attribute support; encodes the name
* so that there will be no '=' characters in the result.
*/
static char *
url_encode(const char *in)
{
const char *s;
char *d;
int out_len = 0;
char *out;
for (s = in; *s != '\0'; s++) {
if (*s < 33 || *s > 126 || *s == '%' || *s == '=')
out_len += 3;
else
out_len++;
}
out = (char *)malloc(out_len + 1);
if (out == NULL)
return (NULL);
for (s = in, d = out; *s != '\0'; s++) {
/* encode any non-printable ASCII character or '%' or '=' */
if (*s < 33 || *s > 126 || *s == '%' || *s == '=') {
/* URL encoding is '%' followed by two hex digits */
*d++ = '%';
*d++ = "0123456789ABCDEF"[0x0f & (*s >> 4)];
*d++ = "0123456789ABCDEF"[0x0f & *s];
} else {
*d++ = *s;
}
}
*d = '\0';
return (out);
}
/*
* Encode a sequence of bytes into a C string using base-64 encoding.
*
* Returns a null-terminated C string allocated with malloc(); caller
* is responsible for freeing the result.
*/
static char *
base64_encode(const char *s, size_t len)
{
static const char digits[64] =
{ 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O',
'P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d',
'e','f','g','h','i','j','k','l','m','n','o','p','q','r','s',
't','u','v','w','x','y','z','0','1','2','3','4','5','6','7',
'8','9','+','/' };
int v;
char *d, *out;
/* 3 bytes becomes 4 chars, but round up and allow for trailing NUL */
out = (char *)malloc((len * 4 + 2) / 3 + 1);
if (out == NULL)
return (NULL);
d = out;
/* Convert each group of 3 bytes into 4 characters. */
while (len >= 3) {
v = (((int)s[0] << 16) & 0xff0000)
| (((int)s[1] << 8) & 0xff00)
| (((int)s[2]) & 0x00ff);
s += 3;
len -= 3;
*d++ = digits[(v >> 18) & 0x3f];
*d++ = digits[(v >> 12) & 0x3f];
*d++ = digits[(v >> 6) & 0x3f];
*d++ = digits[(v) & 0x3f];
}
/* Handle final group of 1 byte (2 chars) or 2 bytes (3 chars). */
switch (len) {
case 0: break;
case 1:
v = (((int)s[0] << 16) & 0xff0000);
*d++ = digits[(v >> 18) & 0x3f];
*d++ = digits[(v >> 12) & 0x3f];
break;
case 2:
v = (((int)s[0] << 16) & 0xff0000)
| (((int)s[1] << 8) & 0xff00);
*d++ = digits[(v >> 18) & 0x3f];
*d++ = digits[(v >> 12) & 0x3f];
*d++ = digits[(v >> 6) & 0x3f];
break;
}
/* Add trailing NUL character so output is a valid C string. */
*d++ = '\0';
return (out);
}
|